Table Of Contents; Figure - Toshiba GR200 Series Instruction Manual
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- Instruction manual (1563 pages) ,
- Instruction manual (1176 pages) ,
- Instruction manual (22 pages)
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Under-voltage element for phase-to-phase (UVS-DIFL)
(iv)
For UVS-DIFL relay element the user can set the sensitivity using setting [UVS-DIFL]. The
setting value is selected from 5.0 to 130.0V.
Under-voltage change detection element (UVD-DIFL)
(v)
Suppose there is a difference between the voltage vector at present (V M ) and the pre-voltage
vector measured one sampling cycle ago (V N ). When the magnitude of the difference between
is larger than setting [DUV-DIFL], the UVD-DIFL element† is operated. The setting value is
chosen among 1 to 20V.
†Note: UVD-DIFL element (shown in Figure 2.2-4) is programmed with setting [DUV-
DIFL] as described above. Similarly, signals for monitoring and PLC output signals
are referred 'UVD-DIFL-AT' etc., as shown in Figure 2.2-4 and Figure 2.2-6.
Check relays activation
(vi)
The user can set On for respective scheme switches [DIFLFS-OCD-EN], [DIFLFS-OC-EN],
[DIFL-UV-EN], [DIFL-UVS-EN], and [DIFL-DUV-EN] so that the user can select the operation of
the respective check relays.
CT circuit-failure detection (DIFL-CTF)
2.2.3
The CT circuit-failure-detection function (DIFL-CTF) is to detection of the breaking wire in
the CT circuit. Signals of the check relays are injected into the below logic so that a trip signal
is not issued upon occurrence of CT failure.
8400021ABB1
840002EBB0
EXTERNAL_DIFL-CTF
8000021C20
A
DIFL-
8100021C21
B
CTF
8200021C22
C
≥1
CTFL-EN
OPT-ON
ON
t
1
From check relays
UVD-DIFL-AT (†)
≥1
UVD-DIFL-BT (†)
UVD-DIFL-CT (†)
UV-DIFL-CT
UVS-DIFL-CT
From CT failure detection
DIFL-CTF-A_DET_T
&
1
DIFL-CTF-B_DET_T
&
1
DIFL-CTF-C_DET_T
&
1
≥1
8100021BB0
810002BB1
DIFL-CTF_BLOCK
From AMF
AMF-ON
The user can select the detection type for the CT circuit-failure using setting [DIFL-CTF].
≥1
0
&
10.00s
S
1
≥1
R
1
≥1
≥1
Figure 2.2-6 CT failure detection logic
&
&
&
1
1
1
&
t
0
&
1
&
0.1s
t
0
1
0.1s
&
t
0
1
0.1s
- 34 -
6F2S1914 (0.49)
8000021B65
≥1
≥1
8100021B66
≥1
≥1
8200021B67
≥1
≥1
8300021B23
t
0
≥1
10.00s
S
1
R
≥1
S
1
R
≥1
S
1
R
≥1
GRL200 (Soft 033 & 037)
To DIFL main logic
8000021B64
To DIFG
To CT failure detection
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